Which OSI layer is responsible for error detection and correction at the data link layer? MCQ with Answer and Explanation

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Which OSI layer is responsible for error detection and correction at the data link layer?

A. Data link layer

B. Physical layer

C. Network layer

D. Transport layer

Answer: Option A

Solution (By JKSSB Mock Tests)

The data link layer performs error detection (and sometimes correction) using frame check sequences.

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Question #1

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Which of the following is a protocol used for secure communication over the internet?

A. HTTP

B. FTP

C. Telnet

D. HTTPS

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Correct Answer: Option D

Explanation:
HTTPS (HTTP Secure) uses SSL/TLS to encrypt data for secure communication.

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Question #2

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Which network topology uses a backbone cable to which all devices are connected via drop lines?

A. Ring

B. Star

C. Bus

D. Mesh

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Correct Answer: Option C

Explanation:
Bus topology uses a single backbone cable and each device connects to it via a drop line.

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Question #3

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Which protocol is used for file transfer with authentication and encryption?

A. SFTP

B. HTTP

C. TFTP

D. FTP

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Correct Answer: Option A

Explanation:
SFTP (SSH File Transfer Protocol) provides secure file transfer with encryption.

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